Piston ring



Oct. 18, 1932.

w. R. G, ANDREASEN ET AL I Filed Nov. l0. 1930 PISTON RING 2Sheets-Sheet 2 P ig. '5.

(l. @.TDLEMAN.

Patented Oct. 18, 12932 OFFICE f WALTER R. G. ANDREASEN-AND CLIFFORD,TOLEMANQOF- EAST-BOSTON, JMIASSAVCIEU-` y SETTS, ASSIGNORS 0FONE-*THIRD T0 PETER iKANE. OFBOSTON, MASSACHUSETTS PIs'roN nineApplication filed November'l, 1930. SerialNo. 94,-68f 1..

yThe present invention relates to.V pistons and piston rings, the objectbeing generally to provide a structure of this character which can beeasily applied and which` will result in an ei'ective and sealingengagement between the piston and the cooperating cylinder.

More particularly the present invention relates to a sectional pistonring and preferpiston generally of any rdesired construction ably to apiston ring of the type in which springs carried by the piston eXert anoutward pressure upon they rings so as to cause the rings to press intosealing engagement with the cylinder walls.

One object of the invention is to provide a pistonring which will notpermit any sub-- stantial pressure being trapped between the piston ringand the piston or bull ring.

In the embodiment of this invention dis-v closed in the drawingsaccompanying the present application and described in the followingspecication, the piston ring consists of four overlapping quadrants, oneend of each quadrant carrying a sealing block which overlaps theadjacent quadrant7 the piston carrying a helical spring which engagesthe. rear face of the sealing block and transmits this pressure to theadjacent'pair of quadrants. By this construction, the entire outer areaof each segment or quadrant is constantly maintained in resilient andvsealing engagement with the ycylinder walls until substantially all theavailable wearing thickness of the ring is worn oil.

Other objects and advantages that flow from the present invention willbecome apparent to persons skilled inthe art from the accompanyingdrawings and the. following specification; it being understood thattheVform of the invention shown herein is illus- V- trative of my inventionand modiication.

thereof,falling within the scope of the appended claims, will beapparent to persons skilled in the art. y Y

In the drawings: u

Fig. 1 is a side elevation of a piston carrying piston rings embodyingthe present invention. Y'

Fig. 2 is a view taken on line 2-2 of Fig. 1.

vOf Fig: 2. n

Fig; 4 is a sectional viewtaken on line 4r-4 of Fig. 2.

` 9' Fig. 5 is a sectional view taken on'line5-5 of Fig. `2.

- Fig. 6 is a perspectivezview of the sealing block.

Referring the drawings, 10 designates' a to end of the inner face of thering, the same being` bordered bythe portions 14V and 15,

above and below, groove 13'. Y 1 The outer facev ofthe ringand of eachrespectively, of the segment is also divided into three longitudi-Inalrzones, the middle zone being twicethe height of theupper and lowerzones, the latter` Zonesjbeing equal in height. Parts of -the middlezone are cutaway to meet the rear channel. 134 as shown at 16 andy 17,leaving the ing one or more intermediate portions 19 uncutl While, asshown, only one bridge 19 is provided, it will -beunderstood' that ifvdesired-the numberof such Vbridges may beincreased, thenumber-depending upon the size tions. kThe ends 18 of the segments arepro- One end of each segment carries a sealing block 21 whose detailconstruction appears in vided with overlapping shouldered portions v 'o0Fig. 3 is a sectional view taken on line-3 -f3 y A'S0' ends-ofthesegments 18 uncut-and also leavofthe ring and'upon otheroperating condi-Figure 6. IThe block 21 comprises an arcuate 1 base 22 adapted to fitVwithin the bull ring of Y the piston and having a height substantiallyequal to the total height of the segment. The 1 laterally projectinglongitudinal lug`23 is adapted to fit into the end portion of the.channel 13 of the segmentV and is held fixed by means ofl pins 24 whichpas: through the por- "loo tion 14 and 15 of the segment. The block 21is so disposed With relation to the segment carrying it that it projectstherefrom, so that When a set of these segments are assembled in thebull ring of the piston the sealing blocks are made to overlap adjacentsegments' and' the lug 23 is disposed in part in channel 13 Y of onesegment and in part in channell of the othere segment.

The piston is provided With a series of i radial recesses 25 at pointsdisposed behindl the sealing blocks 21, these recesses having helicalsprings 26 Which press against the sealing blocks, Which in turntransmit this pressure to the overlapping ends of the segments. r'Therecesses 25 are also adapted to receive discs 29 to adjust the pressureof the springs. By means of such discs the Wear on the rings may betaken up. Y

VIn order to facilitate the proper assembly of the ring on the pistonand in the bull ring, and in order to obviate any ,possible rotation ofthe piston ring Within the bull ring, the piston is provided with aseries of projecting lugs which enter the channels 13. Some of theselugs, as those indicated by the reference character 27, engage the endsof -the sealing block 21. Others, such as lugs 28, are disposedimmediately behind the bridges 19 v It will be seen that by means of thepiston ring shown herein an effective sealing will be obtained With aminimum friction.

Having described' the invention it Will be understood that the same isnot to belimited to the specific form shown herein.

We claim:

The combination of a Vpiston having a packing ring groove, a packingring disposed in said groove and comprising a plurality of arcuatesegments, each segment having a -channel formed on its inner face andalso Ahaving cut-'out'iportions on its Wearing face in communicationwith said channel, a seal- Aingblock carried by one end of each segment,said sealing block interlocking with Vsaid channels of adjacentsegments, a spring vcarried' by said piston and exerting a pressure uponsaid sealing block.

, In testimony whereof We have aiixed our signatures to thisspecication. v

' vHALTER R. G. ANDREASEN.

CLIFFORD A- TOLEMAN.

